Decay of the isoscalar giant monopole resonance in 208Pb

Brandenburg, S.; Borghols, W.T.A.; Drentje, A.G.; Ekström, L.P.; Harakeh, Mohsen; Woude, A. van der; Hakanson, A; Nilsson, L.; Olsson, N.; Pignanelli, M.; Лео, Р. Де

doi:10.1016/0375-9474(87)90344-7

Cited by 103 publications

(40 citation statements)

References 43 publications

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“…These processes are implicitly included in MDA, resulting in extra multipole strength at higher excitation energies where extracted cross sections are quite low. These conclusions have been validated in coincidence measurements, with decay neutrons and protons emitted at backward angles, where no such spurious strength is observed [26,27,[44][45][46]. In the E x =9.35-35 MeV region, the observed E0 strength distribution exhausts a total of ∼125% of the EWSR.…”

Section: 37]supporting

confidence: 55%

“…There also is some extra strength beginning at E x ∼20 MeV. The exact nature of this extra strength is not well understood; however, similar contributions have been observed previously in other nuclei [34,43] and this spurious strength has been attributed to contributions from three-body channels such as knock-out reactions [26,27]. These processes are implicitly included in MDA, resulting in extra multipole strength at higher excitation energies where extracted cross sections are quite low.…”

Section: 37]mentioning

confidence: 56%

“…In heavymass nuclei, the experimentally observed giant-resonance strength comprises a broad peak exhausting nearly 100% of the energy-weighted sum rule (EWSR) [25]. However, identification of giant resonances in lighter nuclei (A < 60) is somewhat ambiguous due to the fragmenta-tion of strength distributions and an increase in the observed spurious strength from other three-body channels [26,27]. Additionally, significant overlap of the strength distributions of different multipoles leads to difficulties in the separation of individual resonances in a multipoledecomposition analysis (MDA).…”

Section: Introductionmentioning

confidence: 99%

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Effect of ground-state deformation on isoscalar giant resonances inSi28

et al. 2016

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Multipole strength distributions for isoscalar L ≤ 2 transitions in 28 Si have been extracted using 386-MeV inelastic α scattering at extremely forward angles, including 0• . Observed strength distributions are in good agreement with microscopic calculations for an oblate-deformed ground-state. In particular, a large peak at an excitation energy of 17.7 MeV in the isoscalar giant monopole resonance (ISGMR) strength is consistent with the calculations.

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Section: 37]supporting

confidence: 55%

Section: 37]mentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

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Effect of ground-state deformation on isoscalar giant resonances inSi28

et al. 2016

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“…Refs. [23][24][25][26][27][28][29][30] and have been considered to be compressional nuclear vibrations.…”

Section: Introductionmentioning

confidence: 99%

GENERATOR COORDINATE METHOD CALCULATIONS FOR GROUND AND FIRST EXCITED COLLECTIVE STATES IN ⁴He, ¹⁶O AND ⁴⁰Ca NUCLEI

Ivanov

Antonov

Gaidarov

2000

Int. J. Mod. Phys. E

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The main characteristics of the ground and, in particular, the first excited monopole state in the 4 He, 16 O and 40 Ca nuclei are studied within the generator coordinate method using Skyrme-type effective forces and three construction potentials, namely the harmonic-oscillator, the square-well and Woods-Saxon potentials. Calculations of density distributions, radii, nucleon momentum distributions, natural orbitals, occupation numbers and depletions of the Fermi sea, as well as of pair density and momentum distributions are carried out. A comparison of these quantities for both ground and first excited monopole states with the available empirical data and with the results of other theoretical methods are given and discussed in detail.

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“…On the other hand, we do not have a lot of experimental data on the decay properties of the giant resonances because of difficulty and complexity of the experiments. Recently we obtained interesting results of the coincidence experiments (e, e'n) done by several groups [1][2][3][4] about neutron decay of giant monopole and quadrupole resonances in medium-heavy and heavy nuclei. They drew some conclusions about the ratio of the direct decay and the existence of the precompound decay.…”

Section: Introductionmentioning

confidence: 96%

Particle decay of resonant state generated by direct reaction

Shiro

Adachi

1986

Z. Physik A - Atomic Nuclei

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A framework is presented for studying two step reactions illustrated by A+a~B*+b, B*~ C+c. In the first step, a direct reaction excites a resonant state (e.g., giant resonances or isobaric analog resonances), which decays by a particle emission in the second step. Feshbach's projection operator method is used to obtain a reaction amplitude, which consists of a compound part and a direct part. The latter corresponds to a knock-out process when the direct reaction is inelastic scattering. A compound part includes contributions from the direct decay of doorway states as well as the multistep decay. The statistical theory of precompound reactions is applied to this multistep decay and an explicit expression is given for the cross section. 24.50+g; 24.60. Dr

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Decay of the isoscalar giant monopole resonance in 208Pb

Cited by 103 publications

References 43 publications

Effect of ground-state deformation on isoscalar giant resonances inSi28

Effect of ground-state deformation on isoscalar giant resonances inSi28

GENERATOR COORDINATE METHOD CALCULATIONS FOR GROUND AND FIRST EXCITED COLLECTIVE STATES IN ⁴He, ¹⁶O AND ⁴⁰Ca NUCLEI

Particle decay of resonant state generated by direct reaction

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Decay of the isoscalar giant monopole resonance in 208Pb

Cited by 103 publications

References 43 publications

Effect of ground-state deformation on isoscalar giant resonances inSi28

Effect of ground-state deformation on isoscalar giant resonances inSi28

GENERATOR COORDINATE METHOD CALCULATIONS FOR GROUND AND FIRST EXCITED COLLECTIVE STATES IN 4He, 16O AND 40Ca NUCLEI

Particle decay of resonant state generated by direct reaction

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Product

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GENERATOR COORDINATE METHOD CALCULATIONS FOR GROUND AND FIRST EXCITED COLLECTIVE STATES IN ⁴He, ¹⁶O AND ⁴⁰Ca NUCLEI